Initially, I was using Quickbooks (QB) and then when I go a couple more properties and multiple LLCs it was difficult to manage on QB and required multiple QB subscriptions and this got expensive.

It looks like you're on the right track with your math, but a couple things could help.

Like @Jay Hinrichs said, it's just cheap insurance..... my clients that buy my new builds will do sewer scopes as well.. we have not had any bellies but we have had debris and rags etc stuck in them.. better to find them up front than to have a back up in a brand new 750k home LOL..

There are multi-million dollar houses that you can walk just a couple short blocks and watch the neighborhood get pretty rough and potentially dangerous.

#1 I don't know anything about billboards, but I have considered purchasing land a couple of times that had them already in place. 

I have been an agent for about 3.5 years, and working on acquiring my first couple deals for flips/BRRRR's asap.

., @Jay Hinrichs and @V.G Jason have done an excellent job of laying out a flaw in your thinking, and I will take it a couple of points further.1.

There are separate entrances and exits.I’ve decided to design them pretty much identically, minus a couple decor and furniture items. 

Also the Adelson family of Las Vegas Sands fame have purchased a couple of big parcels with hopes to build a giant casino/convention resort perhaps anchored by the arena for the Mavericks for which they also just purchased majority ownership from Mark Cuban. 

In a dream world - the comprehensive solution does all this: *task management and sequencing where you can drop a property into a sequence ie day 1 call, day 2 mailer (have it automatically mail out something like a postcard) day 3 etc etc etc*project management outside of the outreach sequences for what's next in the process ie schedule inspection, send the contract, etc etc*ability to have multiple users drive around and if you see a property you can tag an address and add it into a marketing sequence, and also track the streets you've hit so you're not wasting time driving by the same houses more than once *dialer (ability to parallel dial numerous numbers simultaneously to make cold calling more efficient - Ive used tools like orum and kixie in other industries, and when you receive a pickup, the other calls are dropped) *skip tracing/data provider *website landing page for converting online visitors to leads*electronic signature/docusign*secondary branded landing site on different URL for blasts for deal disposition to your buyer listWhat am I missing?